Sound Bugs are mainframe devices found in Sankaku missions of difficulty 2 and higher. They can also be found in some Vault objective rooms.

If a Sound Bug is able to hear most noises caused by the agency, they will alert all guards from a Euclidean distance of 12 or less from the Sound Bug and raise the alarm level by 1. All alerted guards will become interested in the source of the noise. This happens at most once per turn per sound bug, so even if another noise is detected by the sound bug in the same turn, the interest point will always be the first tile where that sound bug heard a noise that turn, and the alarm tracker is not raised further. A pulsing red line leading up to a circle will eminate upwards from triggered Sound Bugs.

When hacked, Sound Bugs provide hearing for the agency.

* This is true even if the EMP Pack doesn't disable the Sound Bug, whether because it was out of range, or because the Sound Bug had magnetic reinforcements.